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Glossary
WinSock
Windows Socket Interface: A software interface that makes it
possible for an assortment of applications to use and share an Internet con-
nection. The WinSock software consists of a Dynamic Link Library
(DLL) with supporting programs such as a dialer program that initiates
the connection.
workgroup switching
A switching method that supplies high-speed
(100Mbps) transparent bridging between Ethernet networks as well as high-
speed translational bridging between Ethernet and CDDI or FDDI.
X.25
An ITU-T packet-relay standard that defines communication
between DTE and DCE network devices. X.25 uses a reliable data-link layer
protocol called LAPB. X.25 also uses PLP at the network layer. X.25 has
mostly been replaced by Frame Relay.
X.25 protocol
First packet-switching network, but now mostly used in
Europe. Replaced in U.S. by Frame Relay.
XTAG
A locally significant numerical value assigned by the MLS-SE to
each MLS-RP in the layer 2 network. See also: MLS-SE, MLS-RP.
ZIP
Zone Information Protocol: A session-layer protocol used by Apple-
Talk to map network numbers to zone names. NBP uses ZIP in the determi-
nation of networks containing nodes that belong to a zone. See also: ZIP
storm and zone.
ZIP storm
A broadcast storm occurring when a router running AppleTalk
reproduces or transmits a route for which there is no corresponding zone
name at the time of execution. The route is then forwarded by other routers
downstream, thus causing a ZIP storm. See also: broadcast storm and ZIP.
zone
A logical grouping of network devices in AppleTalk. See also: ZIP.
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